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//	"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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//	A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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//	PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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//	SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
//   Purpose:  Registry utility function definitions..
//   $Id$


#include <stdafx.h>
#include <Common/RegistryUtil.h>

// Get a named value of type REG_SZ from the specified registry key.
HRESULT xport::RegGetValueString(const HKEY hKeyBase, const char *sKey, const char *sValue, char **psValue)
{
	HRESULT hr = E_FAIL;
	// Check the arguments.
	if(hKeyBase && sKey && psValue) {
		// Open the owner registry key.
		HKEY hKey = 0;
		if(::RegOpenKeyEx(hKeyBase, sKey, 0, KEY_QUERY_VALUE, &hKey) == ERROR_SUCCESS) {
			DWORD dwDataType = 0, dwDataLen = 0;
			// Get the length of the string value.
			if(::RegQueryValueEx(hKey, sValue, 0, &dwDataType, 0, &dwDataLen) == ERROR_SUCCESS) {
				if(dwDataType == REG_SZ) {
					// Allocate memory for the string value.
					*psValue = reinterpret_cast<char *>(::malloc(sizeof(char) * (dwDataLen + 1)));
					// Get the string value.
					if(::RegQueryValueEx(hKey, sValue, 0, &dwDataType, reinterpret_cast<LPBYTE>(*psValue), &dwDataLen) == ERROR_SUCCESS) {
						hr = S_OK;
						*(*psValue + dwDataLen) = '\0';
					}
				}
			}
			::RegCloseKey(hKey);
		}
	} else
		hr = E_INVALIDARG;
	return hr;
}
